/* s_nextafterf.c -- float version of s_nextafter.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#include <sys/cdefs.h>

#include "math.h"
#include "float.h"

typedef int int32_t;

float
nextafterf(float x, float y)
{
    volatile float t;
    int32_t hx,hy,ix,iy;

    GET_FLOAT_WORD(hx,x);
    GET_FLOAT_WORD(hy,y);
    ix = hx&0x7fffffff;     /* |x| */
    iy = hy&0x7fffffff;     /* |y| */

    if((ix>0x7f800000) ||   /* x is nan */
       (iy>0x7f800000))     /* y is nan */
       return x+y;
    if(x==y) return y;      /* x=y, return y */
    if(ix==0) {             /* x == 0 */
        SET_FLOAT_WORD(x,(hy&0x80000000)|1);/* return +-minsubnormal */
        t = x*x;
        if(t==x) return t; else return x;   /* raise underflow flag */
    }
    if(hx>=0) {             /* x > 0 */
        if(hx>hy) {             /* x > y, x -= ulp */
        hx -= 1;
        } else {                /* x < y, x += ulp */
        hx += 1;
        }
    } else {                /* x < 0 */
        if(hy>=0||hx>hy){           /* x < y, x -= ulp */
        hx -= 1;
        } else {                /* x > y, x += ulp */
        hx += 1;
        }
    }
    hy = hx&0x7f800000;
    if(hy>=0x7f800000) return x+x;  /* overflow  */
    if(hy<0x00800000) {     /* underflow */
        t = x*x;
        if(t!=x) {      /* raise underflow flag */
            SET_FLOAT_WORD(y,hx);
        return y;
        }
    }
    SET_FLOAT_WORD(x,hx);
    return x;
}
